Hi Rich; thanks for your hint. But it does not run like your suggest. The triangles cannot be moved. At least on my surface. They light up red yes; but cannot be moved. I suspect I have somewhere else unintentionally changed a parameter in the main settings. Because I have already created several animations with clips that do not have such a timeline bar because the length of the clip is selected via the "duration" function.
![on this picture you can see within the main timeline the clip called "erste palette"](/uploads/imported_attachments/oGPS_1.PNG "on this picture you can see within the main timeline the clip called "erste palette"")
![here you can see the opened clip "erste palette" there is not this white line with the triangles](/uploads/imported_attachments/HenH_2.PNG "here you can see the opened clip "erste palette" there is not this white line with the triangles")